*{margin: 0;padding: 0;}
a{text-decoration: none;}
li{
	list-style: none;
}
/*头部样式*/
header{
	width: 100%;
	height: 50px;
	line-height:50px;
	background: white;
	display: flex;
	justify-content: space-around;
	align-items: center;	
}
/*导航*/
nav{
	width: 100%;
	background: linear-gradient(#eee,white,#ccc);
}
nav ul{
	width: 100%;
	height: 60px;
	display: flex;
	justify-content: space-between;
	align-items: center;
}
nav ul li{
	width: 25%;
	text-align: center;
}
nav ul li a:hover{
	display: inline-block;
	color: orange;
	line-height: 54px;
	border-bottom: 5px solid orange;
}
hr{
	border: 10px solid #eee;
}
